EP0600238A1 - Optical disc recording/reproducing apparatus - Google Patents
Optical disc recording/reproducing apparatus Download PDFInfo
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- EP0600238A1 EP0600238A1 EP93117622A EP93117622A EP0600238A1 EP 0600238 A1 EP0600238 A1 EP 0600238A1 EP 93117622 A EP93117622 A EP 93117622A EP 93117622 A EP93117622 A EP 93117622A EP 0600238 A1 EP0600238 A1 EP 0600238A1
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- compressed
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- signal
- memory
- recording
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10527—Audio or video recording; Data buffering arrangements
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00007—Time or data compression or expansion
Definitions
- the present invention relates to an optical disk recording/reproducing apparatus, and more particularly to an optical disc recording/reproducing apparatus suitable for performing the operation of recording, reproducing, or recording and reproducing a plurality channel of signals.
- FIG.5 Most of conventional optical disc recording/reproducing apparatuses have the structure such as shown in the block diagram of Fig.5.
- reference numeral 1 represents an audio signal input terminal.
- An audio signal inputted to this terminal 1 is converted into a digital signal by an A/D converter 3 and compressed time sequentially.
- the compressed digital signal is stored in a memory 30 under the control of a system controller 8.
- the system controller 8 is constructed mainly of a microcomputer to control the circuits of the apparatus.
- the system controller 8 includes essentially a CPU, a ROM, a RAM, an input port, and an output port (not shown), as well known in the art.
- ROM stores programs for controlling CPU. In accordance with the programs, CPU fetches external data via the input port, transfers data to and from RAM, to process data and output, if necessary, the processed data from the output port.
- Reference numeral 9 represents a modulator for RF modulating the digital signal stored in the memory 30 and supplying the modulated signal to a driver 10 to drive an integrated head block 11 having a magnetic head pickup and to record data on a disc (not shown). In this manner, the input record signal is recorded on the disc at predetermined areas in the form of time sequentially compressed signals.
- Reference numeral 12 represents an RF amplifier for RF amplifying a signal reproduced by the head block 11.
- the amplified signal is supplied to a demodulator 13 and stored in the memory 30.
- the reproduced compressed signal is expanded by an expander 15 and converted into an analog signal by a D/A converter 17 to be outputted from an output terminal 19.
- Reference numeral 21 represents a mechanism controller for controlling the mechanism of the head block 11, under the control of the system controller 8.
- Reference numeral 22 represents a disc motor connected to the mechanism controller 21.
- the signal A I is converted into a digital signal by the A/D converter 3.
- the digital signal is divided into groups (a1, b1,...) each having 512 samples and compressed by the compressor 5 to generate a compressed signal A C .
- the input signal a1 is compressed to generate a compressed signal a2
- the input signal b1 is compressed to generate a compressed signal b2, and so on.
- the compressed signal A C is therefore formed by the compressed signals a2, b2,...
- the signals a1, b1,... are inputted during the time periods (t 0A to t 1A ), (t 1A to t 2A ),...
- the signals a1, b1,... are compressed to generate the compressed signals a2, b2,... during a predetermined compression time period u starting from t 1A , t 2A ,... to constitute the compressed signal A C which is stored in the memory 30.
- the input signal A I stored as the compressed signal A c in the memory is recorded time sequentially on the disc at predetermined areas as recorded signals a3, b3,... while driving the disc motor 22 and moving the magnetic head of the head block 11 under the control of the mechanism controller 21 which is supervised by the system controller 8.
- signals c3, d3,... time sequentially recorded on the disc are picked up by the magnetic head as a preexpanded or pre-extended signal B C constituted by pre-expanded signals c2, d2,... which are then expanded to generate extended or expanded output signals c1, d1,... during the time periods (t 0B to t 1B ), (t 1B to t 2B ),.. as an output signal B O .
- the input signal A I can be recorded and the recorded signal can be reproduced as the output signal B O .
- the present invention has been made in consideration of the above circumstances. It is therefore an object of the invention to solve the above-described problems and provide an optical disc recording/reproducing apparatus capable of time divisionally recording/reproducing signals of a plurality of channels by providing separate memories respectively for the recording and reproducing operations.
- an optical disc recording/reproducing apparatus having a memory for storing a compressed signal of an input signal, a modulator for modulating the compressed signal read from the memory, a head block for recording the modulated and compressed signal on an optical disc and reproducing the modulated and compressed signal recorded in the optical disc, a demodulator for demodulating the modulated and compressed signal, the demodulated and compressed signal being stored in the memory, an expander for expanding the demodulated and compressed signal read from the memory to output an original signal, wherein: the memory includes a first memory and a second memory, the first memory storing a plurality channel of the compressed signals, and the second memory storing a plurality channel of the demodulated and compressed signals, the read/write to and from the first and second memories for one channel of the compressed signals and the demodulated and compressed signals is executed alternately and time divisionally using idle time periods generated between adjacent ones of another channel of the compressed signals and demodulated and compressed signals, to thereby allow to execute the operation of recording
- an input signal to be recorded is converted into a digital signal by an A/D circuit, compressed, and stored in the first memory.
- the compressed signal read from the first memory is supplied to the modulator and applied to the head block to record it on an optical disc at predetermined record tracks while controlling a disc motor and moving a magnetic head of the head block by a mechanism controller which is supervised by a system controller.
- the compressed signal recorded on the optical disc is picked up by the head block, and stored via an RF amplifier and the demodulator in the second memory.
- the demodulated and compressed signal read from the second memory under the control of the system controller, is expanded by the expander, and converted into an analog signal to output the reproduced signal.
- a signal of one channel is processed during idle time periods generated between adjacent signals of another channel, the signal of one channel being alternately and time divisionally processed relative to the signal of another channel one after another.
- the idle time periods of one channel are used for processing another channel while controlling the memory read/write time divisionally.
- a plurality type of musical audio tone signals may be recorded on multiple tracks and reproduced to generate desired musical tones of a high quality in various manners.
- Figs.1 to 4 are block diagram showing the optical disc recording/reproducing apparatus of the invention, and Figs.2 to 4 are timing charts explaining the operations of time divisionally recording a plurality channel of signals, reproducing a plurality channel of signals, and recording and reproducing a plurality channel of signals, respectively.
- reference numeral 1 represents an input terminal for an audio signal A I to be recorded
- reference numeral 2 represents an input terminal for an audio signal B I to be recorded
- Reference numeral 3 represents an A/D converter for converting the input signal A I into a digital signal
- reference numeral 4 represents an A/D converter for converting the input signal B I into a digital signal
- Reference numerals 5 and 6 each represent a compressor for compressing the digital signal in the format predetermined by a system controller 8.
- Reference numeral 7 represents a first memory for storing the converted digital signals for the input signals A I and B I . Under the control of the system controller 8, the converted digital signals of two channels stored in the first memory 7 are read and supplied to a modulator 9. The modulated signal is then supplied to a driver 10 for driving a magnetic head of an integrated head block 11 to record the modulated signal.
- a signal recorded on the disc is picked up by the head block 11 and amplified by an RF amplifier 12.
- the amplified signal is demodulated by a demodulator 13 and stored in a second memory 14.
- the demodulated signals of two channels are read from the second memory 14, expanded by expanders 15 and 16, and converted to analog signals by D/A converters 17 and 18 to be outputted from output terminals 19 and 20.
- the optical disc recording/reproducing apparatus constructed as above can time divisionally record, reproduce, or record and reproduce a plurality channel of signals.
- Fig.2 is a timing chart explaining the operation of time divisionally recording signals of two channels.
- An input signal A I is converted into a digital signal by the A/D converter 3.
- the digital signal is divided into groups (a1, b1, c1, d1 ...) each having, e.g., 512 samples, and compressed by the compressor 5 to generate a compressed signal A C .
- the input signal a1 is compressed to generate a compressed signal a2
- the input signal b1 is compressed to generate a compressed signal b2, and so on.
- the compressed signal A C is therefore formed by the compressed signals a2, b2, c2, d2,.... Assuming that the signals a1, b1,...
- the signals a1, b1,... are compressed to generate the compressed signals a2, b2,... during a predetermined compression time period u starting from t 1A , t 2A ,... to constitute the compressed signal A C which is stored in the first memory 7.
- the input signal B I is converted into a digital signal by the A/D converter 4.
- the digital signal is divided into groups (e1, f1, g1, h1, ...) each having, e.g., 512 samples, and compressed by the compressor 6 to generate a compressed signal B C .
- the input signal e1 is compressed to generate a compressed signal e2
- the input signal f1 is compressed to generate a compressed signal f2, and so on.
- the compressed signal B C is therefore formed by the compressed signals e2, f2, g2, h2,.... Assuming that the signals a1, b1,... are inputted during the time periods (t 0B to t 1B ), (t 1B to t 2B ),..., the signals e1, f1,...
- the input signals A I and B I stored as the compressed signals A C and B C including signals a2, b2,... and e2, f2,... in the first memory 7 and modulated by the modulator 9 are recorded time divisionally on a disc (not shown) at predetermined truck areas as recorded signals a3, b3,... and e3, f3,... while driving the disc motor 22 and moving the magnetic head of the head block 11 under the control of the mechanism controller 21 which is supervised by the system controller 8.
- the compressed signal a2 read from the first memory 7 is modulated by the modulator and recorded on the disc, there is an idle time period for the first memory 7 until the next compressed signal b2 is read and modulated by the modulator. Therefore, during this idle time period, the next compressed signal e2 is read and modulated by the modulator 9. In this manner, the compressed signals a2, b2,... and e2, f2,... are alternately and time divisionally recorded on the disc by using idle time periods.
- the input signals A I and B I are recorded on the disc in the order of a3, b3,... and e3, f3,... as shown in Fig.2 while driving the disc motor 22 and moving the magnetic head of the head block 11 under the control of the mechanism controller 21 which is supervised by the system controller 8.
- the compressed signals a2, b2,... and e2, f2,... of the two-channel input signals A I and B I can be alternately and time divisionally recorded by using the idle time periods, the recording time of a plurality channel of signals can be shortened efficiently.
- Fig.3 is a timing chart explaining the operation of time divisionally reproducing signals of two channels and outputting reproduced signals A O and B O .
- the recorded signals a3, b3,... and e3, f3,... are picked up by the magnetic head of the head block 11, amplified by the RF amplifier 12, demodulated by the demodulator 13, and stored in the second memory 14.
- the demodulated signals i.e., pre-extended or pre-expanded signals a2, b2,... and e2, f2,... are alternately and time divisionally read from the second memory 14, expanded by the expanders 15 and 16 to obtain reproduced signals A O (a1, b1,...) and B O (e1, f1,...) which are converted into analog audio signals and outputted from output terminals 19 and 20.
- the signal a2 compressed by the predetermined compression time period u is expanded to the signal a1 having a time period (t OA to t 1A ), the signal b2 compressed to the time period u is expanded to the signal b1 having a time period (t 1A to t 2A ), and so on.
- the signal e2 compressed by the predetermined compression time period u is expanded to the signal e1 having a time period (t OB to t 1B ) following t OA
- the signal f2 compressed to the time period u is expanded to the signal f1 having a time period (t 1B to t 2B ) following t 1A , and so on.
- the signals e2, f2,... can be time divisionally read during the idle time periods between the signals a2 and b2, b2 and c2,... at the compression time period u .
- the signals e2, f2,... are then expanded by the respective channel expanders 15 and 16 and reproduced. In this manner, signals of two channels can be alternately and time divisionally reproduced.
- Fig.4 is a timing chart explaining the operation of time divisionally recording and reproducing signals of two channels.
- the signals a1, b1,... of the input signal A I are compressed.
- the compressed signals a2, b2,... constituting the compressed signal A C are recorded on a disc as signals e3, f3,....
- the recorded signals e3, f3,... are demodulated and stored in the second memory 14 as pre-expanded signals e2, f2,.... which are then read therefrom alternately and time divisionally relative to reading the compressed signals a2, b2,... and expanded by the expanders 15 and 16 to output a reproduced signal B O constructed by signals e1, f1,....
- the signal e3 is read from the disk during the idle time period between the signals a2 and b2.
- the signal e2 compressed to the compression time period u is read during the idle time period between the signals a2 and b2 starting from the time period (t 1A + u), the signals a2 and e2 being processed continuously in the time domain as shown in Fig.4.
- the other signals f2, g2,... are processed in the similar manner during respective idle time periods.
- the read operation of the compressed signals a2, b2,... and that of the pre-expanded signals e2, f2,... are therefore alternately and time divisionally executed to provide the improved efficiency of the operation of recording and reproducing signals of two channels.
- a single memory having a large capacity may also be used by dividing the memory area into two independent areas which are controlled separately by the system controller 8.
- an external switching circuit may be used to selectively transfer necessary data to the modulator 9 or from the demodulator 13.
- a plurality of independently controllable memories are used to time divisionally record/reproduce a plurality channel of signals by using the idle time periods and head block. Accordingly, it is possible to perform the operation of recording, reproducing, or recording and reproducing a plurality channel of signals efficiently and in a short time.
- a plurality type of musical audio tone signals may be recorded on multiple tracks.
- reproduced tone signals are mixed by a mixer as desired to generate desired musical tones of a high quality, or mixed musical tone signals may be recorded again.
- the apparatus of the invention is simple in structure, and the function of the apparatus may be improved easily depending upon the control software for a memory without an increased cost.
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Abstract
An optical disc recording/reproducing apparatus capable of performing the operation of recording, reproducing, or recording and reproducing a plurality channel of signals efficiently and in a short time, by controlling memories. The apparatus has a compressor (5b) for compressing an input signal supplied via an A/D converter (3,4), a first memory (7) for storing the compressed signal, a disc recording unit having a modulator (9) for modulating the compressed signal and a head block (11) for recording the modulated signal on an optical disc, a disc reproducing unit having a demodulator (13) for demodulating the compressed signal read from the optical disc by the head block, a second memory (14) for storing the demodulated signal, an expander (15,16) for expanding the demodulated signal read from the second memory, and a D/A converter (17,18) for converting the read signal.
Description
- The present invention relates to an optical disk recording/reproducing apparatus, and more particularly to an optical disc recording/reproducing apparatus suitable for performing the operation of recording, reproducing, or recording and reproducing a plurality channel of signals.
- Most of conventional optical disc recording/reproducing apparatuses have the structure such as shown in the block diagram of Fig.5. In Fig.5, reference numeral 1 represents an audio signal input terminal. An audio signal inputted to this terminal 1 is converted into a digital signal by an A/
D converter 3 and compressed time sequentially. The compressed digital signal is stored in amemory 30 under the control of asystem controller 8. - The
system controller 8 is constructed mainly of a microcomputer to control the circuits of the apparatus. Thesystem controller 8 includes essentially a CPU, a ROM, a RAM, an input port, and an output port (not shown), as well known in the art. ROM stores programs for controlling CPU. In accordance with the programs, CPU fetches external data via the input port, transfers data to and from RAM, to process data and output, if necessary, the processed data from the output port. -
Reference numeral 9 represents a modulator for RF modulating the digital signal stored in thememory 30 and supplying the modulated signal to adriver 10 to drive an integrated head block 11 having a magnetic head pickup and to record data on a disc (not shown). In this manner, the input record signal is recorded on the disc at predetermined areas in the form of time sequentially compressed signals. -
Reference numeral 12 represents an RF amplifier for RF amplifying a signal reproduced by the head block 11. The amplified signal is supplied to ademodulator 13 and stored in thememory 30. The reproduced compressed signal is expanded by anexpander 15 and converted into an analog signal by a D/A converter 17 to be outputted from anoutput terminal 19. -
Reference numeral 21 represents a mechanism controller for controlling the mechanism of the head block 11, under the control of thesystem controller 8.Reference numeral 22 represents a disc motor connected to themechanism controller 21. - With the optical disc recording/reproducing apparatus constructed as above, the operation of recording/reproducing an audio signal is performed in the manner explained in the timing chart of Fig.6.
- In recording an input signal AI applied to the input terminal 1, the signal AI is converted into a digital signal by the A/
D converter 3. The digital signal is divided into groups (a₁, b₁,...) each having 512 samples and compressed by thecompressor 5 to generate a compressed signal AC. Namely, the input signal a₁ is compressed to generate a compressed signal a₂, the input signal b₁ is compressed to generate a compressed signal b₂, and so on. The compressed signal AC is therefore formed by the compressed signals a₂, b₂,... Assuming that the signals a₁, b₁,... are inputted during the time periods (t0A to t1A), (t1A to t2A),..., the signals a₁, b₁,... are compressed to generate the compressed signals a₂, b₂,... during a predetermined compression time period u starting from t1A, t2A,... to constitute the compressed signal AC which is stored in thememory 30. - The input signal AI stored as the compressed signal Ac in the memory is recorded time sequentially on the disc at predetermined areas as recorded signals a₃, b₃,... while driving the
disc motor 22 and moving the magnetic head of the head block 11 under the control of themechanism controller 21 which is supervised by thesystem controller 8. - In reproducing the recorded signal, while the
disc motor 22 is driven and the magnetic head of the head block 11 is moved under the control of themechanism controller 21 which is supervised by the system controller, signals c₃, d₃,... time sequentially recorded on the disc are picked up by the magnetic head as a preexpanded or pre-extended signal BC constituted by pre-expanded signals c₂, d₂,... which are then expanded to generate extended or expanded output signals c₁, d₁,... during the time periods (t0B to t1B), (t1B to t2B),.. as an output signal BO. In the above manner, the input signal AI can be recorded and the recorded signal can be reproduced as the output signal BO. - With such a conventional optical disc recording/reproducing apparatus, however, since the
memory 30 cannot be used at the same time for both the recording operation and reproducing operation, the recording and reproducing operations are required to be executed separately and hence time sequentially, as explained with Fig.6. It takes therefore a long time to execute the recording and reproducing operations. - The present invention has been made in consideration of the above circumstances. It is therefore an object of the invention to solve the above-described problems and provide an optical disc recording/reproducing apparatus capable of time divisionally recording/reproducing signals of a plurality of channels by providing separate memories respectively for the recording and reproducing operations.
- According to one aspect of the present invention, there is provided an optical disc recording/reproducing apparatus of the type having a memory for storing a compressed signal of an input signal, a modulator for modulating the compressed signal read from the memory, a head block for recording the modulated and compressed signal on an optical disc and reproducing the modulated and compressed signal recorded in the optical disc, a demodulator for demodulating the modulated and compressed signal, the demodulated and compressed signal being stored in the memory, an expander for expanding the demodulated and compressed signal read from the memory to output an original signal, wherein:
the memory includes a first memory and a second memory, the first memory storing a plurality channel of the compressed signals, and the second memory storing a plurality channel of the demodulated and compressed signals, the read/write to and from the first and second memories for one channel of the compressed signals and the demodulated and compressed signals is executed alternately and time divisionally using idle time periods generated between adjacent ones of another channel of the compressed signals and demodulated and compressed signals, to thereby allow to execute the operation of recording, reproducing, or recording and reproducing a plurality channel of signals. - According to the invention, an input signal to be recorded is converted into a digital signal by an A/D circuit, compressed, and stored in the first memory. The compressed signal read from the first memory is supplied to the modulator and applied to the head block to record it on an optical disc at predetermined record tracks while controlling a disc motor and moving a magnetic head of the head block by a mechanism controller which is supervised by a system controller.
- The compressed signal recorded on the optical disc is picked up by the head block, and stored via an RF amplifier and the demodulator in the second memory. The demodulated and compressed signal read from the second memory under the control of the system controller, is expanded by the expander, and converted into an analog signal to output the reproduced signal.
- For the operation of recording a plurality channel of signals, a signal of one channel is processed during idle time periods generated between adjacent signals of another channel, the signal of one channel being alternately and time divisionally processed relative to the signal of another channel one after another.
- Therefore, the operation of recording a plurality channel of signals can be performed efficiently and in a short time.
- Similarly, for the operation of reproducing, or recording and reproducing a plurality channel of signals, the idle time periods of one channel are used for processing another channel while controlling the memory read/write time divisionally. For example, a plurality type of musical audio tone signals may be recorded on multiple tracks and reproduced to generate desired musical tones of a high quality in various manners.
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- Fig.1 is a block diagram showing an embodiment of an optical recording/reproducing apparatus according to the present invention;
- Fig.2 is a timing chart explaining the operation of time divisionally recording a plurality channel of signals;
- Fig.3 is a timing chart explaining the operation of time divisionally reproducing a plurality channel of signals;
- Fig.4 is a timing chart explaining the operation of time divisionally recording and reproducing a plurality channel of signals;
- Fig.5 is a block diagram showing a conventional optical recording/reproducing apparatus; and
- Fig.6 is a timing chart explaining conventional recording and reproducing operations.
- Embodiments of the optical disc recording/reproducing apparatus of the present invention will be described with reference to Figs.1 to 4. In Figs.1 to 4, like elements to those shown in Figs.5 and 6 are represented by identical reference numerals and symbols. Figs.1 is a block diagram showing the optical disc recording/reproducing apparatus of the invention, and Figs.2 to 4 are timing charts explaining the operations of time divisionally recording a plurality channel of signals, reproducing a plurality channel of signals, and recording and reproducing a plurality channel of signals, respectively.
- Referring to Fig.1, reference numeral 1 represents an input terminal for an audio signal AI to be recorded, and
reference numeral 2 represents an input terminal for an audio signal BI to be recorded.Reference numeral 3 represents an A/D converter for converting the input signal AI into a digital signal, andreference numeral 4 represents an A/D converter for converting the input signal BI into a digital signal.Reference numerals system controller 8.Reference numeral 7 represents a first memory for storing the converted digital signals for the input signals AI and BI. Under the control of thesystem controller 8, the converted digital signals of two channels stored in thefirst memory 7 are read and supplied to amodulator 9. The modulated signal is then supplied to adriver 10 for driving a magnetic head of an integrated head block 11 to record the modulated signal. - A signal recorded on the disc is picked up by the head block 11 and amplified by an
RF amplifier 12. The amplified signal is demodulated by ademodulator 13 and stored in asecond memory 14. Under the control of thesystem controller 8, the demodulated signals of two channels are read from thesecond memory 14, expanded byexpanders A converters output terminals - The optical disc recording/reproducing apparatus constructed as above can time divisionally record, reproduce, or record and reproduce a plurality channel of signals.
- Fig.2 is a timing chart explaining the operation of time divisionally recording signals of two channels. An input signal AI is converted into a digital signal by the A/
D converter 3. The digital signal is divided into groups (a₁, b₁, c₁, d₁ ...) each having, e.g., 512 samples, and compressed by thecompressor 5 to generate a compressed signal AC. Namely, the input signal a₁ is compressed to generate a compressed signal a₂, the input signal b₁ is compressed to generate a compressed signal b₂, and so on. The compressed signal AC is therefore formed by the compressed signals a₂, b₂, c₂, d₂,.... Assuming that the signals a₁, b₁,... are inputted during the time periods (t0A to t1A), (t1A to t2A),..., the signals a₁, b₁,... are compressed to generate the compressed signals a₂, b₂,... during a predetermined compression time period u starting from t1A, t2A,... to constitute the compressed signal AC which is stored in thefirst memory 7. - Similarly, the input signal BI is converted into a digital signal by the A/
D converter 4. The digital signal is divided into groups (e₁, f₁, g₁, h₁, ...) each having, e.g., 512 samples, and compressed by thecompressor 6 to generate a compressed signal BC. Namely, the input signal e₁ is compressed to generate a compressed signal e₂, the input signal f₁ is compressed to generate a compressed signal f₂, and so on. The compressed signal BC is therefore formed by the compressed signals e₂, f₂, g₂, h₂,.... Assuming that the signals a₁, b₁,... are inputted during the time periods (t0B to t1B), (t1B to t2B),..., the signals e₁, f₁,... are compressed to generate the compressed signals e₂, f₂,... during the predetermined compression time period u starting fromfirst memory 7. - Under the control of the
system controller 8, the input signals AI and BI stored as the compressed signals AC and BC including signals a₂, b₂,... and e₂, f₂,... in thefirst memory 7 and modulated by themodulator 9 are recorded time divisionally on a disc (not shown) at predetermined truck areas as recorded signals a₃, b₃,... and e₃, f₃,... while driving thedisc motor 22 and moving the magnetic head of the head block 11 under the control of themechanism controller 21 which is supervised by thesystem controller 8. - After the compressed signal a₂ read from the
first memory 7 is modulated by the modulator and recorded on the disc, there is an idle time period for thefirst memory 7 until the next compressed signal b₂ is read and modulated by the modulator. Therefore, during this idle time period, the next compressed signal e₂ is read and modulated by themodulator 9. In this manner, the compressed signals a₂, b₂,... and e₂, f₂,... are alternately and time divisionally recorded on the disc by using idle time periods. - As described above, the input signals AI and BI are recorded on the disc in the order of a₃, b₃,... and e₃, f₃,... as shown in Fig.2 while driving the
disc motor 22 and moving the magnetic head of the head block 11 under the control of themechanism controller 21 which is supervised by thesystem controller 8. - Since the compressed signals a₂, b₂,... and e₂, f₂,... of the two-channel input signals AI and BI can be alternately and time divisionally recorded by using the idle time periods, the recording time of a plurality channel of signals can be shortened efficiently.
- Fig.3 is a timing chart explaining the operation of time divisionally reproducing signals of two channels and outputting reproduced signals AO and BO. Contrary to the recording operation, the recorded signals a₃, b₃,... and e₃, f₃,... are picked up by the magnetic head of the head block 11, amplified by the
RF amplifier 12, demodulated by thedemodulator 13, and stored in thesecond memory 14. Under the control of thesystem controller 8, the demodulated signals, i.e., pre-extended or pre-expanded signals a₂, b₂,... and e₂, f₂,... are alternately and time divisionally read from thesecond memory 14, expanded by theexpanders output terminals - Of the pre-expanded signals a₂, b₂,... and e₂, f₂,... stored in the second memory, the signal a₂ compressed by the predetermined compression time period u is expanded to the signal a₁ having a time period (tOA to t1A), the signal b₂ compressed to the time period u is expanded to the signal b₁ having a time period (t1A to t2A), and so on.
- The signal e₂ compressed by the predetermined compression time period u is expanded to the signal e₁ having a time period (tOB to t1B) following tOA, the signal f₂ compressed to the time period u is expanded to the signal f₁ having a time period (t1B to t2B) following t1A, and so on.
- Similar to the recording operation, the signals e₂, f₂,... can be time divisionally read during the idle time periods between the signals a₂ and b₂, b₂ and c₂,... at the compression time period u. The signals e₂, f₂,... are then expanded by the
respective channel expanders - Fig.4 is a timing chart explaining the operation of time divisionally recording and reproducing signals of two channels. The signals a₁, b₁,... of the input signal AI are compressed. The compressed signals a₂, b₂,... constituting the compressed signal AC are recorded on a disc as signals e₃, f₃,.... On the other hand, the recorded signals e₃, f₃,... are demodulated and stored in the
second memory 14 as pre-expanded signals e₂, f₂,.... which are then read therefrom alternately and time divisionally relative to reading the compressed signals a₂, b₂,... and expanded by theexpanders - As above, also in the operation of recording the input signal AI and reproducing the recorded signal and outputting the signal BO, the signal e₂ compressed to the compression time period u is read during the idle time period between the signals a₂ and b₂ starting from the time period (t1A + u), the signals a₂ and e₂ being processed continuously in the time domain as shown in Fig.4.
- The other signals f₂, g₂,... are processed in the similar manner during respective idle time periods. The read operation of the compressed signals a₂, b₂,... and that of the pre-expanded signals e₂, f₂,... are therefore alternately and time divisionally executed to provide the improved efficiency of the operation of recording and reproducing signals of two channels.
- In the above embodiment, the operations of recording, reproducing, and recording and reproducing signals of two channels have been described. Signals of three or more channels may also be processed in the manner described above. Further, although audio signals have been used in the above description, other signals such as video signals, character signals, graphic signals may also be used for the optical disc recording/reproducing.
- Instead of using the separate first and
second memories system controller 8. - Still further, although necessary data is read from either the
first memory 7 orsecond memory 14 under the control of thesystem controller 8, an external switching circuit may be used to selectively transfer necessary data to themodulator 9 or from thedemodulator 13. - As described so far, according to the optical disc recording/reproducing apparatus of the present invention, a plurality of independently controllable memories are used to time divisionally record/reproduce a plurality channel of signals by using the idle time periods and head block. Accordingly, it is possible to perform the operation of recording, reproducing, or recording and reproducing a plurality channel of signals efficiently and in a short time.
- A plurality type of musical audio tone signals may be recorded on multiple tracks. In this case, reproduced tone signals are mixed by a mixer as desired to generate desired musical tones of a high quality, or mixed musical tone signals may be recorded again.
- Since it is possible to perform the operation of recording, reproducing, or recording and reproducing a plurality channel of signals efficiently and in a short time, other information such as voices, speeches, songs, foreign languages may be recorded while listening to the reproduced information, to use an optical disc recording/reproducing apparatus more effectively.
- The apparatus of the invention is simple in structure, and the function of the apparatus may be improved easily depending upon the control software for a memory without an increased cost.
Claims (2)
- An optical disc recording/reproducing apparatus of the type having a memory for storing a compressed signal of an input signal, a modulator for modulating the compressed signal read from the memory, a head block for recording the modulated and compressed signal on an optical disc and reproducing the modulated and compressed signal recorded in the optical disc, a demodulator for demodulating the modulated and compressed signal, the demodulated and compressed signal being stored in the memory, an expander for expanding the demodulated and compressed signal read from the memory to output an original signal, wherein:
said memory includes a first memory and a second memory, said first memory storing a plurality channel of said compressed signals, said second memory storing a plurality channel of said demodulated and compressed signals, the read/write to and from said first and second memories for one channel of said compressed signals and said demodulated and compressed signals is executed alternately and time divisionally using idle time periods generated between adjacent ones of another channel of said compressed signals and demodulated and compressed signals, to thereby allow to execute the operation of recording, reproducing, or recording and reproducing a plurality channel of signals. - An optical disc recording/reproducing apparatus comprising:
a head block for recording a compressed signal on an optical disc and reproducing a compressed signal recorded on said optical disc;
means for compressing a series of continuous input signals of each block length in a time domain;
a first memory for storing said compressed input signal block;
control means for controlling said head block to intermittently record said compressed signal block read from said first memory on said optical disc at areas assigned to said series of continuous input signals, and for controlling said head block to intermittently read said compressed signal block recorded in said optical disc;
a second memory for storing said compressed signal block read from said optical disc by said head block; and
means for expanding said compressed signal block read from said second memory to generate a series of continuous reproduced signals,
wherein said control means controls said head block to alternately and time divisionally execute the recording and reproducing operations of said compressed signal block.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4291413A JPH06139697A (en) | 1992-10-29 | 1992-10-29 | Optical disk recording and reproducing device |
JP291413/92 | 1992-10-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0600238A1 true EP0600238A1 (en) | 1994-06-08 |
Family
ID=17768571
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93117622A Ceased EP0600238A1 (en) | 1992-10-29 | 1993-10-29 | Optical disc recording/reproducing apparatus |
Country Status (4)
Country | Link |
---|---|
US (1) | US5687158A (en) |
EP (1) | EP0600238A1 (en) |
JP (1) | JPH06139697A (en) |
DE (1) | DE600238T1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0932153A2 (en) * | 1998-01-21 | 1999-07-28 | Pioneer Electronic Corporation | Information recording and reproducing apparatus |
EP1003166A2 (en) * | 1993-12-24 | 2000-05-24 | Sony Corporation | Information data recording/reproducing apparatus and information data processing system |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
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US6487155B1 (en) | 2000-04-11 | 2002-11-26 | Doug Carson & Associates, Inc. | Optical disc authentication using alternate data modulation encoding schemes |
US6477124B2 (en) | 2000-11-15 | 2002-11-05 | Doug Carson & Associates, Inc. | Varying the rate at which data appear on an optical disc rotated at a constant linear velocity to prevent unauthorized duplication of the disc |
US7568081B2 (en) * | 2000-11-15 | 2009-07-28 | Doug Carson & Associates, Inc. | Authenticating a data storage medium using predetermined inter-sector relationships |
US7102973B1 (en) | 2002-04-12 | 2006-09-05 | Dc Ip, Llc | Media authentication using altered sector sizes |
JP2006286130A (en) * | 2005-04-04 | 2006-10-19 | Hitachi Ltd | Method and device for recording digital data |
US20080131088A1 (en) * | 2006-11-30 | 2008-06-05 | Mitac Technology Corp. | Image capture method and audio-video recording method of multi-media electronic device |
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1993
- 1993-10-29 EP EP93117622A patent/EP0600238A1/en not_active Ceased
- 1993-10-29 DE DE0600238T patent/DE600238T1/en active Pending
-
1996
- 1996-05-15 US US08/645,037 patent/US5687158A/en not_active Expired - Lifetime
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EP1003166A2 (en) * | 1993-12-24 | 2000-05-24 | Sony Corporation | Information data recording/reproducing apparatus and information data processing system |
EP1003166A3 (en) * | 1993-12-24 | 2003-10-08 | Sony Corporation | Information data recording/reproducing apparatus and information data processing system |
EP0932153A2 (en) * | 1998-01-21 | 1999-07-28 | Pioneer Electronic Corporation | Information recording and reproducing apparatus |
EP0932153A3 (en) * | 1998-01-21 | 1999-10-13 | Pioneer Electronic Corporation | Information recording and reproducing apparatus |
Also Published As
Publication number | Publication date |
---|---|
US5687158A (en) | 1997-11-11 |
JPH06139697A (en) | 1994-05-20 |
DE600238T1 (en) | 1994-12-08 |
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